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Old 06-19-2004, 07:13   #1 (permalink)
351 XE on LPG
 
Join Date: Jul 2003
Location: Perth, Western Australia
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Recommended spark plugs for straight gas

I'm running 302 heads on my straight LPG 351 and was wondering what you guys recommend for spark plugs. I'm currently using an NGK (one colder then stock), with a smaller gap after reading the following article.

NGK's comments . . .

To eliminate the influence of L.P.G. and to obtain optimum spark plug performance, NGK recommends:

-The use of a spark plug with one heat range colder (if possible) than that listed in the catalogue: eg, BPR6EFS-13 (L.P.G.) instead of BPR5EFS-13 (petrol) for VN 6 Cylinder Commodore.

AND

-The reduction of the electrode gap by 0.1 mm (which lowers the spark plug required voltage)
(SOURCE = http://www.ngkspark.com.au/bulletin_T92-1.htm)

I can't find the article now, but a guy recommended grinding half of the electrode away to better expose the flame front to the charge. It's a delicate operation, but I think it helped.

Anybody tried Iridium plugs? That small tip doesn't look as though it will give much of a spark, but I know looks are quite deceiving.

Regards Rhett
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Old 06-20-2004, 02:37   #2 (permalink)
ESP
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Re: Recommended spark plugs for straight gas

I'm using an American Made GAPLESS plug made by Torquemaster.
Great plugs, work very well with my CRANE Hi 6 Ignition system.

Very expensive, but certainly better than the NGK plugs I used to use.
They last heaps longer and with minimal cleaning effort every service interval, they perform great.

I've also found that I don't need to replace them. They seem to last forever.
I initially read about them on their website www.torquemaster.com.

I tried them and I'll stick with them.
I also have been running straight gas on these plugs for over 6 years now and have never had a problem with them. I particularly like the fact that you never have to fandangle around with the bloody gap measurements.

My 2c
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Old 06-20-2004, 15:49   #3 (permalink)
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Re: Recommended spark plugs for straight gas

Iridium's all the way.

Worth the extra money and they have an ultra fine tip from the factory so there's no need to file them down.

You will probably need to order the lower heat range plugs, I doubt many places would keep them in stock.
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Old 06-22-2004, 05:22   #4 (permalink)
351 XE on LPG
 
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Re: Recommended spark plugs for straight gas

thanks ESP and xdc351.
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